Abstract
AGONISTS that stimulate protein kinase C (PKC) induce profound changes in cell morphology correlating with the reorganization of submembranous actin1,2, but no direct connection between PKC and actin assembly has been identified3. The myristoylated, alanine-rich C kinase substrate (MARCKS) binds calmodulin4,5 and is a predominant, specific substrate of PKC which is phosphorylated during macrophage and neutrophil activation6–8, growth factor-dependent mitogenesis9,10and neurosecretion11,12; it is redistributed from plasma membrane to cytoplasm when phosphorylated13–15 and is involved in leukocyte motility14,15. Here we report that MARCKS is a filamentous (F) actin crosslinking protein, with activity that is inhibited by PKC-mediated phosphorylation and by binding to calcium–calmodulin. MARCKS may be a regulated crossbridge between actin and the plasma membrane, and modulation of the actin crosslinking activity of the MARCKS protein by calmodulin and phosphorylation represents a potential convergence of the calcium–calmodulin and PKC signal transduction pathways in the regulation of the actin cytoskeleton.
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Hartwig, J., Thelen, M., Resen, A. et al. MARCKS is an actin filament crosslinking protein regulated by protein kinase C and calcium–calmodulin. Nature 356, 618–622 (1992). https://doi.org/10.1038/356618a0
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DOI: https://doi.org/10.1038/356618a0